CC-Link IE Field Network Connection Guide – Digital I/O Operation Check

Conducting a comprehensive operation check verifies that digital I/O modules on the CC-Link IE Field Network communicate effectively with the master PLC. This ensures that signals transmit accurately between the PLC and I/O points. Early testing helps catch issues, guaranteeing reliable system performance in real-world applications.

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Steps for Digital I/O Operation Check on CC-Link IE Field Network

1. Initial Power and Connection Verification

Before testing, confirm that all devices are powered and connected properly.

• Power Check: Confirm power is supplied to all I/O modules, the master PLC, and connected devices on the network.
• Network Diagnostics: Use GX Works3 diagnostics tools to verify network connectivity. Check that all devices are visible in the network configuration, and that no errors are indicated.

2. Monitor Digital I/O Status in GX Works3

In GX Works3, monitor digital I/O points in real time to ensure correct functionality.

• Enable Monitor Mode: Activate monitor mode in GX Works3 to observe real-time data for each input and output connected to the network.
• Confirm Device Communication: Ensure each I/O module sends and receives data as expected, with each input and output updating based on the connected sensors, switches, or equipment.

3. Testing Digital Input Responses

Check each digital input to verify accurate signal changes in response to external devices.

• Trigger Input Devices: Manually activate each sensor or switch connected to the input module. Observe that each corresponding input in GX Works3 changes state (e.g., ON/OFF) as expected.
• Verify PLC Responses: Confirm that the PLC program responds correctly to each input signal. For example, activating a switch should trigger the programmed PLC response, such as turning on a specific output.

4. Testing Digital Output Responses

Ensure each digital output module activates devices accurately in response to PLC commands.

• Issue Commands: Manually issue ON/OFF commands to each output in GX Works3 to test device responses.
• Observe Output Responses: Confirm that each connected device (e.g., lights, motors) responds correctly to commands without delays or errors.

5. Simulating Operational Scenarios

For a comprehensive test, simulate normal and fault conditions to confirm system robustness.

• Simulate Routine Operation: Run the PLC program in simulation mode to verify how digital I/O modules function under expected conditions.
• Fault Testing: Temporarily disconnect a device to observe how the system handles and recovers from common faults. This ensures the PLC program and network can manage interruptions efficiently.

6. Final Review and Troubleshooting

After testing, analyze results and resolve any discrepancies.

• Review Error Logs: Check error logs for any messages recorded during testing. Address any communication errors, timeouts, or unexpected signals.
• Verify Address Mappings: Confirm that each I/O point is mapped to the correct device address and that all settings align between GX Works3 and the network configuration.
• Retest as Necessary: Make necessary adjustments and retest the affected points to ensure issues are fully resolved.

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Best Practices for Operation Check

• Document Results: Record test outcomes for each I/O point. This documentation aids future maintenance and troubleshooting.
• Test at Various Speeds: If feasible, test I/O response at different operational speeds to ensure stability.
• Monitor Environment: Confirm that network devices perform consistently under typical environmental conditions such as temperature and humidity.

Troubleshooting Tips

• Unresponsive Inputs or Outputs: Re-check wiring and verify correct device addresses in both hardware and software.
• Network Communication Errors: Ensure secure cable connections and verify that station numbers align in GX Works3.
• Signal Loss: Check for any sources of electromagnetic interference (EMI) that could disrupt communication.

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Conclusion